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For the case of all layers not on the same fs, return the copy up origin inode st_dev/st_ino for non-dir from stat(2). This guaranties constant st_dev/st_ino for non-dir across copy up. Like the same fs case, st_ino of non-dir is also persistent. If the st_dev/st_ino for copied up object would have been the same as that of the real underlying lower file, running diff on underlying lower file and overlay copied up file would result in diff reporting that the two files are equal when in fact, they may have different content. Therefore, unlike the same fs case, st_dev is not persistent because it uses the unique anonymous bdev allocated for the lower layer. Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.